Therapeutic agent for pruritus

a technology of therapeutic agents and pruritus, which is applied in the direction of drug compositions, antibody medical ingredients, peptide/protein ingredients, etc., can solve the problems of inability to assert, failure to produce therapeutic effects, and inhibition of cytokine function, so as to achieve the effect of treating or preventing pruritus

Active Publication Date: 2010-12-09
CHUGAI PHARMA CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Benefits of technology

[0008]The present invention was achieved in view of the circumstances described above. An objective of the present invention is to provide agents for treating or preventing pruritus.
[0009]The present inventors conducted dedicated studies to achieve the objective described above. The present inventors discovered that NR10 antagonists such as neutralizing antibodies against NR10 are useful as therapeutic or preventive agents for pruritus, thereby completing the present invention.
[0010]The present invention relates to agents for treating or preventing pruritus. More specifically, the present invention provides:

Problems solved by technology

On the other hand, there are many examples of failure where no therapeutic effects were produced when a single cytokine, such as IL-4, was blocked alone, due to the activation of compensatory pathways in actual pathological conditions.
However, it cannot be asserted that forced cytokine expression in mice or a high concentration of blood cytokine in pathological mice are actual causes of the disease.
Thus, the inhibition of cytokine function does not necessarily produce a therapeutic effect in diseases with elevated cytokine expression.
It is thus difficult to predict from the expression level of a cytokine what disease the inhibition of the cytokine produces a therapeutic effect on.

Method used

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  • Therapeutic agent for pruritus
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  • Therapeutic agent for pruritus

Examples

Experimental program
Comparison scheme
Effect test

example 1

Assessment of IL-31-Induced Scratching Behavior

[0086]Ten μg of mouse IL-31 (in house) was intravenously administered to 9-week-old normal female BALB / c mice (Charles River Laboratories Japan). The scratching behavior was monitored and analyzed for 12 hours immediately after administration using a scratching counting system (MicroAct; NeuroScience Inc.). As a result, the IL-31-administered group (n=8) showed a significant increase in the number of scratchings with a peak at about five hours after the administration, as compared to the group administered with a vehicle (PBS containing 0.5% BALB / c mouse serum) (n=8). This IL-31-induced scratching behavior was completely suppressed by intravenous administration of 350 mg / kg BM095, an anti-mouse NR10 neutralizing antibody, prior to IL-31 administration (n=8) (FIG. 1). This result demonstrates that the anti-NR10 neutralizing antibody has an effect of suppressing IL-31-induced pruritus.

Effect of Anti-NR10 Neutralizing Antibody in Mite Anti...

example 2

Suppressing Effect of H0L0 Against IL-31-Induced Pruritus in Cynomolgus Monkeys

[0090]The effect of anti-human NR10 antibody H0L0 (heavy chain amino acid sequence / SEQ ID NO: 17; light chain amino acid sequence / SEQ ID NO: 18) on pruritus induced by intravenously administering cynomolgus IL-31 to 4- to 5-year-old cynomolgus monkeys was examined. PBS (vehicle) or H0L0 was intravenously administered at 0.01, 0.03, 0.06, 0.3, and 0.6 mg / kg. Twenty-four hours after intravenous administration, 1 g / kg of cynomolgus IL-31 was intravenously administered, and then the behavior was recorded with a video camera for two hours. The number of scratchings was counted while replaying the recorded video, assuming three or more consecutive scratching actions as a scratching. The result showed that H0L0 reduced the number of cynomolgus IL-31-induced scratchings in a dose-dependent manner (FIG. 5). This result demonstrates that the anti-NR10 antibody H0L0 has a suppressing effect against pruritus.

referential example 1

Establishment of NR10— and OSMR-Expressing Ba / F3 cell lines

[0091]The human NR10 cDNA (WO 00 / 75314 SEQ ID NO: 1 / SEQ ID NO: 16) was inserted into the expression vector pCOS1 (Biochem. Biophys. Res. Commun. 228, p838-45, 1996), and the resulting vector was named pCosNR10.3. An oncostatin M receptor cDNA (OSMR, GenBank accession No. NM003999) was isolated by PCR from a human placental library, and the expression vector pCos1-hOSMR was constructed in the same manner. 10 μg each of the vectors were simultaneously introduced into mouse IL-3-dependent pro-B cell-derived cell line Ba / F3 by electroporation (BioRad Gene Pulser, 960 μf, 0.33 kV). After introduction, human IL-31 was added, and the cells were cultured to obtain a cell line that proliferates in an IL-31-dependent manner. In the same manner, a mouse IL-31-dependent cell line was also produced from Ba / F3 cells expressing the mouse NR10 and mouse OSMR genes.

[0092]Both cell lines exhibited an ED50 of several ng / ml and well proliferate...

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Abstract

The present inventors isolated clone BM095 from a human antibody phage library, which had a strong growth inhibitory activity in the IL-31-dependent Ba/F3 cell growth assay system. When administered to pruritus model mice, the anti-mouse NR10 neutralizing antibody exhibited a marked symptom-suppressing effect. Thus, it was revealed that anti-NR10 neutralizing antibodies are useful as therapeutic agents for pruritus.

Description

TECHNICAL FIELD[0001]The present invention relates to agents for treating or preventing pruritus.BACKGROUND ART[0002]Many cytokines are known as humoral factors involved in the growth and differentiation of various types of cells, or in the activation of differentiated mature cell functions. Cytokine-stimulated cells produce different types of cytokines, thereby forming networks of multiple cytokines in the body. Biological homeostasis is maintained by a delicate balance of the mutual regulation between cytokines in these networks. Many inflammatory diseases are thought to result from a failure of such cytokine networks. Thus, monoclonal antibody-based anti-cytokine therapy is drawing much attention. For example, anti-TNF antibodies and anti-IL-6 receptor antibodies have been demonstrated to be highly effective clinically. On the other hand, there are many examples of failure where no therapeutic effects were produced when a single cytokine, such as IL-4, was blocked alone, due to t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K39/395
CPCA61K2039/505C07K16/2869C07K2317/24C07K2317/21C07K2316/96C07K2317/76A61P17/00A61P17/04A61K38/17A61K39/395
Inventor HIGUCHI, YOSHINOBUKASUTANI, KEIKOKITAMURA, HIDETOMOHASEGAWA, MASAKAZU
Owner CHUGAI PHARMA CO LTD
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